Recently had 10 upper porcelain veneers. The veneers are rubbing up against the insides of my cheeks and lower lip. The area is tender. The tissue is raw and sores are beginning to form. The sores are similar to canker sores like you get when wearing braces. It becomes very painful to talk or to eat. Is this normal? If yes then how long will it take to get better? What's the cause for it and what should be the solution to fix it?